1
Dragon Heater: Horizontal Feed Rocket (U.S.A.)

This unit combines the firebox of a traditional stove with the internal stack of a rocket heater. Wood feeds through a horizontal tube into a primary combustion chamber. Hot, turbulent gasses enter a second vertical combustion chamber, after which heat extraction occurs. Half the heat surrounds the secondary chamber, while the rest enters a granite-filled area for delayed release.

2
Firemaster: The IntensiFire (New Zealand)

The IntensiFire is a low-cost downdraft retrofitted stove designed to improve combustion by up to 60 percent. It adds the benefits of secondary combustion air to older units; the cost of the retrofit will likely be around the same as that of a replacement baffle, which would no longer be required.

3
Helbro Stoves: Gymse (Denmark)

The Gymse showcases the inherent qualities of a masonry heater, including a user-friendly design, highly efficient burns that are also clean, and 24 hours of heat from a single fire. This stove is compatible with any size chimney flue, and it can be constructed from clay and almost any kind of stone.

4
Hwam: Autopilot IHS (Denmark)

The Hwam Autopilot's Intelligent Heat System measures combustion conditions through the use of a lambda oxygen sensor and a thermocouple. An onboard computer then allocates combustion air to achieve the best possible burn. Temperature can be set with a remote control. Already on the market, this stove meets European Eco-label standards.

5
Intercontinental: 2B4W (U.S.A.)

The 2B4W is a masonry heater that can be built from recycled materials. It consists of two decommissioned steel oil barrels stacked on top of one other. Heat is stored in high-density firebrick and will radiate for up to 24 hours when fired twice a day at a high burn rate. A combustion control system helps reduce operator error, and the exterior can be decorated with a localized motif.

6
Kimberly Stove (U.S.A.)

The Kimberly Stove is a portable gasifier unit that features a thermoelectric generator, hot water coils, an oven, and a 12-volt blower system. Measuring 25-1/2 inches tall with a 10-inch diameter and weighing 56 pounds, it's small enough to fit in a boat or RV. The Kimberly is constructed almost entirely of stainless steel, except for the door glass and gasket materials.

7
University of Maryland: Mulciber (U.S.A.)

The Mulciber features automated heat recovery, ventilation, and burn-control systems that respond to changes in the burning environment and then control airflow to maintain ideal combustion conditions. A coaxial inlet collects excess heat that would otherwise go out the chimney, while thermoelectric generators power fans that circulate heat throughout the room.

8
Ofenbau + Feuerstellen: Eco-labeled Tile Stove (Austria)

Though based on a traditional European Kacheloefen design, this stove integrates a modern combustion chamber similar to those that have satisfied Austrian Eco-label requirements. It achieves low emissions by controlling air movement throughout the stove. Air passes through a tight baffle/damper located in the stove's base and then enters the combustion chamber through slots.

9
Inven, Inc.: SmartStove (U.S.A.)

The SmartStove is an automated system that analyzes the burn and then physically operates draft and fan controls to manipulate the amount of air entering a stove. This maximizes combustion, reducing the need for the user to constantly make adjustments in order to keep a fire burning efficiently. The SmartStove combines electronics and firmware developed specifically for cordwood appliances.

10
Travis Industries: Lopi Cape Cod (U.S.A.)

The Cape Cod is a hybrid of catalytic and non-catalytic technologies. Already in production, this cast-iron stove is 80 percent efficient and produces 0.45 grams per hour of emissions, making it the cleanest unit on the EPA's list of certified wood stoves. Preheated combustion air improves efficiency, while secondary air tubes and a catalytic combustor incinerate almost all remaining particulates.